5. It is essential to remember throughout this work that the word “science” is by no means restricted to natural science. According to Diderot’s definition in the Encyclopedia, if the object of a discipline is only contemplated from different approaches, the technical collection and disposition of observations relative to that object are called “science.” Thus theology, history, and philosophy, as well as physics and mathematics, are sciences. If the object of a discipline is something executed, the technical collection and disposition of rules according to which it is executed is called “art.” By this definition ethics is an art. See “Art,” Encyclopédie, I, 713–14.